Clock



FIG. 1 is a front view of a clock showing my design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a rear view thereof. 

The ornamental design for a clock, as shown and described. 